The remote host is missing updates announced inadvisory RHSA-2012:0050.

KVM (Kernel-based Virtual Machine) is a full virtualization solution forLinux on AMD64 and Intel 64 systems. qemu-kvm is the user-space componentfor running virtual machines using KVM.

A heap overflow flaw was found in the way QEMU-KVM emulated the e1000network interface card. A privileged guest user in a virtual machine whosenetwork interface is configured to use the e1000 emulated driver could usethis flaw to crash the host or, possibly, escalate their privileges on thehost. (CVE-2012-0029)

Red Hat would like to thank Nicolae Mogoreanu for reporting this issue.

This update also fixes the following bug:

* qemu-kvm has a scsi option, to be used, for example, with the-device option: -device virtio-blk-pci,drive=[drive name],scsi=off.Previously, however, it only masked the feature bit, and did not rejectSCSI commands if a malicious guest ignored the feature bit and issued arequest. This update corrects this issue. The scsi=off option can beused to mitigate the virtualization aspect of CVE-2011-4127 before theRHSA-2011:1849 kernel update is installed on the host.

This mitigation is only required if you do not have the RHSA-2011:1849kernel update installed on the host and you are using raw format virtiodisks backed by a partition or LVM volume.

If you run guests by invoking /usr/libexec/qemu-kvm directly, use the-global virtio-blk-pci.scsi=off option to apply the mitigation. If youare using libvirt, as recommended by Red Hat, and have the RHBA-2012:0013libvirt update installed, no manual action is required: guests willautomatically use scsi=off. (BZ#767721)

Note: After installing the RHSA-2011:1849 kernel update, SCSI requestsissued by guests via the SG_IO IOCTL will not be passed to the underlyingblock device when using raw format virtio disks backed by a partition orLVM volume, even if scsi=on is used.

As well, this update adds the following enhancement:

* Prior to this update, qemu-kvm was not built with RELRO or PIE support.qemu-kvm is now built with full RELRO and PIE support as a securityenhancement. (BZ#767906)

All users of qemu-kvm should upgrade to these updated packages, whichcorrect these issues and add this enhancement. After installing thisupdate, shut down all running virtual machines. Once all virtual machineshave shut down, start them again for this update to take effect.

Solution:Please note that this update is available viaRed Hat Network. To use Red Hat Network, launch the RedHat Update Agent with the following command: up2date